Android Spinner

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Spinner

Spinner 是从多个选项中选择一个选项的控件，

类似于桌面程序中的组合框（ComboBox）

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android:spinnerMode="dropdown" //制定模型下拉选项和对话框选项模式

android:entries="@array/week_en" //用于设置Spinner的显示内容

属性值：要求传递的是一个资源字符串数组的id

布局文件：

@array/week_cn 对应的定义在 res/values/strings.xml中

<?xml version="1.0" encoding="utf-8"?>

<string name="app_name">KN_Day05_1_Spinner</string>

<string name="hello_world">Hello world!</string>

<string name="action_settings">Settings</string>

<!-- 通过string-array标签创建字符串数组

通过name属性给数组赋予名字

通过在string-array标签中添加item标签来添加数组元素

每一个item代表一个元素

-->

<string-array name="week_en">

<item >Monday</item>

<item >Tuesday</item>

<item >Wednesday</item>

<item >Thursday</item>

<item >Friday</item>

<item >Saturday</item>

<item >Sunday</item>

</string-array>

<string-array name="week_cn">

</string-array>

</resources>

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package com.example.kn_day05_1_spinner;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

/**

* 功能：在页面中添加2个spinner，实现省市联动效果

* 一个spinner中存储省份名字，一个spinner中存储城市名字，

* 当某省份被选择后，第二个sipnner中对应显示该省份下的所有城市

* ArrayAdapter 适配器的绑定使用

* @author KNOWN

public class MainActivity extends Activity {

Spinner sp1;//省

Spinner sp2;//市

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

sp1 = (Spinner)findViewById(R.id.spinner1);

sp2 = (Spinner)findViewById(R.id.spinner2);

ArrayList<String> provinceList = new ArrayList<String>();

provinceList.add("江苏");

provinceList.add("浙江");

//创建适配器

ArrayAdapter<String> provinceadapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, provinceList);

//设置下拉样式为下拉

provinceadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

sp1.setAdapter(provinceadapter);

ArrayList<String> cityList1 = new ArrayList<String>();

cityList1.add("南京市");

cityList1.add("苏州市");

cityList1.add("无锡市");

ArrayList<String> cityList2 = new ArrayList<String>();

cityList2.add("杭州市");

cityList2.add("宁波市");

cityList2.add("绍兴市");

final ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, cityList1);

final ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, cityList2);

/**

* 设置spinner子选项选中事件

sp1.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view,

int position, long id) {

// TODO Auto-generated method stub

//id spinner子选项的序号从0开始

if(id == 0){

sp2.setAdapter(adapter1);

}else if (id == 1) {

sp2.setAdapter(adapter2);

}

Log.i("==当前选中的省是：", sp1.getSelectedItem().toString());

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

// TODO Auto-generated method stub

}

});

sp2.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view,

int position, long id) {

// TODO Auto-generated method stub

Log.i("==当前选中的市是：", sp2.getSelectedItem().toString());

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

// TODO Auto-generated method stub

}

});

}

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布局文件activity_main.xml:

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